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首页> 外文期刊>Advanced functional materials >Synergetic Effect of Alkali-Site Substitution and Oxygen Vacancy Boosting Vanadate Cathode for Super-Stable Potassium and Zinc Storage
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Synergetic Effect of Alkali-Site Substitution and Oxygen Vacancy Boosting Vanadate Cathode for Super-Stable Potassium and Zinc Storage

机译：Synergetic Effect of Alkali-Site Substitution and Oxygen Vacancy Boosting Vanadate Cathode for Super-Stable Potassium and Zinc Storage

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Layer-structured metal vanadates have attracted extensive attention as cathode materials due to multi-electron redox reactions and versatile cations storage capability. Nevertheless, their actual promotion is still hindered by the sluggish reaction kinetics and inferior phase transition upon repeated cations (de)intercalation. Here, large-sized NH_4~+ is introduced into the K-site of K_(0.43)(NH_4)_(0.12)V_2O_(5–δ) to enable more kinetically favorable oxygen vacancies. The reinforced structure ensures complete solid-solution phase transition and buffers the dramatic structural change upon potassium storage. The stable presence of NH_4~+ as pillars during cycling is also confirmed. Meanwhile, the oxygen vacancies induced by alkali-site substitution can facilitate ion diffusion and enhance the electronic conductivity, as further demonstrated by theoretical calculations. Therefore, it exhibits a high capacity of 117.8 mA g~(?1) at 20 mA g~(?1) with smooth profiles and superior capacity retention of 92.5% after 800 cycles at 1000 mA g~(?1). Such an effective synergetic strategy also promotes its zinc storage capability, which performs negligible selfdischarge behavior and retains a reversible capacity of 216.8 mAh g~(?1) after 3000 cycles at 10 A g~(?1). This synergetic strategy may provide novel perspectives to develop layer-structured cathode and facilitate its practical application in energy storage devices.

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